1. Source Material:
* Rock: If the slope is made of rock, the accumulation at the bottom will be rock fragments, boulders, and scree. This is called talus.
* Soil: If the slope is made of soil, the accumulation will be soil, silt, and clay. This is called colluvium.
* Vegetation: If there is vegetation on the slope, the accumulation might include leaves, branches, and other organic matter.
2. Slope Angle:
* Steeper Slopes: Steeper slopes tend to have more rock fragments because the force of gravity is stronger and can dislodge larger pieces.
* Gently Sloping: Gently sloping areas may have more soil and sediment as the force of gravity is less strong.
3. Climate:
* Wet Climates: Wet climates can lead to erosion and transport of sediment down the slope, resulting in a larger accumulation at the bottom.
* Dry Climates: Dry climates may have less erosion and therefore a smaller accumulation.
4. Human Activity:
* Construction: Construction activities can alter the slope and lead to increased erosion and a larger accumulation at the bottom.
* Deforestation: Removing vegetation can lead to increased erosion and more material accumulating at the bottom of the slope.
In summary, the material accumulating at the bottom of a steep slope is typically a mixture of:
* Rock fragments and boulders (talus)
* Soil and sediment (colluvium)
* Organic matter (leaves, branches)
The specific composition will depend on the factors listed above.
